JWST Peers into the Class I Protostar TMC1A: Atomic Jet and Spatially Resolved Dissociative Shock Region

Abstract Outflows and winds launched from young stars play a crucial role in the evolution of protostars early stages planet formation. However, specific details mechanism behind these phenomena, including how they affect protoplanetary disk structure, are still debated. We present JWST NIRSpec integral field unit observations atomic H 2 lines 1 to 5.1 μ m toward low-mass protostar TMC1A. For first time, collimated jet is detected TMC1A [Fe ii ] line at 1.644 along with corresponding extended 2.12 emission. Toward protostar, we spectrally broad i He emissions velocities up 300 km s −1 that can be explained by combination protostellar accretion wide-angle wind. The continuum dust emission, , O all show emission illuminated outflow cavity wall scattered These demonstrate potential characterize reveal new information about hot inner regions nearby protostars; this case, previously undetected wind ionized well-known outflow.